the answer is -$97 for sure. tvb now,tvbnow,bttvb# T( L. l- [! N/ \1 g9 k9 v0 G; U
Think about it this way # r& d! e Z/ f& o; a- A, r
1) if the 100 bucks is not a fake one, the store owner will gain $3 ($21-$18)9 p# q% X8 E' [) s
2) Now, the owner discovered that the 100 bucks is fake. You can think this as a lost of $100. therefore the overall gain is $3-$100 = -$97 |
發表於 2007-5-16 03:12 AM
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發表於 2007-5-19 03:21 PM
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發表於 2007-5-21 03:49 AM
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